os/overlays/overrides.nix

channels: final: prev: {

  __dontExport = true; # overrides clutter up actual creations

  inherit (channels.latest)
    cachix
    dhall
    discord
    element-desktop
    rage
    nixpkgs-fmt
    qutebrowser
    signal-desktop
    starship
    deploy-rs
    nix

    tdesktop
    arduino
    arduino-cli
    ;

  inherit (channels.master)
    swaynotificationcenter
    ;

  haskellPackages = prev.haskellPackages.override
    (old: {
      overrides = prev.lib.composeExtensions (old.overrides or (_: _: { })) (hfinal: hprev:
        let version = prev.lib.replaceChars [ "." ] [ "" ] prev.ghc.version;
        in
        {
          # same for haskell packages, matching ghc versions
          inherit (channels.latest.haskell.packages."ghc${version}")
            haskell-language-server;
        });
    });

  # Example to override node package
  # nodePackages = prev.nodePackages // { inherit (channels.latest.nodePackages) manta; };
}